"Statistical design of Phase II/III clinical trials for testing therapeutic interventions in COVID-19 patients" . "Srivastava, Deo" . "PMC7456751" . . . "Seth, Anand" . "2020-08-31"^^ . . . "PMC" . "10.1186/s12874-020-01101-z" . . "Pan, Jianmin" . "Qian, Chen" . "BMC Med Res Methodol" . "Bhatnagar, Aruni" . "cc-by" . . . . "Rai, Shesh" .